网页2022/12/01 · 5mm Vial Insert is especially used with 2ML 9-425 Vials, to save the sample. Product Features: 1. Flat bottom vial insert is the economical choise to save the sample. 2. Conical bottom vial insert can perfectly save the sample volume, and reduce the residual. 3. With plastic spring type can not only reduce the residual, but also fix the insert